Features: Volume adjustment: The volume can be adjusted, which is a major advantage of this product. Product screen: LCD digital display screen, high-definition large screen, clear reading. <p >Measuring site: wrist Measuring range: blood pressure 0 ~ 280 mmHg (0 ~ 37.3 kpa), pulse rate 40 ~ 195 beats/min Measuring wrist circumference: 13.5 ~ 21.5 cm Measurement accuracy: blood pressure value ± 0.4 kpa (± 3 mmHg), ± 5% of pulse rate reading</p > Working environment: Operating temperature : 10 ~ 40 Operating humidity: 40% ~ 85% This product is an electronic blood pressure measuring instrument that can measure systolic blood pressure, diastolic blood pressure and heart rate simultaneously. This product is based on the principle of oscillometric design, which can quickly, accurately and reliably measure your blood pressure. Scope of application: This product is only suitable for adults. Application environment: This product is suitable for home or clinical use. The full voice broadcast volume can be adjusted From the start of the measurement to the analysis of the result, the whole process is broadcast in English Exquisite and compact to travel with you at any time The body is small and light, so it can measure pressure anytime, anywhere when business trip, travel, office, etc. Simple one-button measuring operation No need for tedious operation, automatic pressing, automatic measuring, automatic diffusion . 1. Rest for 5 to 10 minutes before measuring blood pressure; 2. Avoid exercising, eating, drinking, coffee, black tea, bathing, smoking, etc. before measurement; 3. Blood pressure will increase when intending to urinate, so please discharge before measurement. Package includes: 1 * blood pressure dynamometer (battery is not not included in the package) Pay attention: Due to manual measurement, please allow slight dimensional tolerances Lighting in photography may cause chromatic aberration compared to real life